Try to align WritableFileWriter buffered writes #3475

Job	Run time
build-linux-cmake-mingw	12m 18s
build-linux-cmake-with-folly	27m 25s
build-linux	17m 16s
check-format-and-targets	25s
build-examples	10m 54s
build-fuzzers	8m 41s
build-linux-clang10-clang-analyze	17m 33s
build-linux-clang10-asan	16m 44s
build-linux-clang10-mini-tsan	24m 9s
build-linux-clang10-ubsan	16m 35s
build-linux-clang-13-no_test_run	7m 28s
build-linux-clang-no_test_run	11m 51s
build-linux-cmake-with-benchmark	19m 30s
build-linux-cmake-with-folly-coroutines	31m 40s
build-linux-cmake-with-folly-lite-no-test	7m 58s
build-linux-encrypted_env-no_compression	16m 0s
build-linux-gcc-10-cxx20-no_test_run	9m 19s
build-linux-gcc-11-no_test_run	10m 21s
build-linux-gcc-8-no_test_run	8m 30s
build-linux-java-static	11m 51s
build-linux-make-with-folly	28m 16s
build-linux-make-with-folly-lite-no-test	9m 35s
build-linux-mini-crashtest	30m 5s
build-linux-release	14m 19s
build-linux-static_lib-alt_namespace-status_checked	19m 1s
build-linux-java	15m 12s
build-linux-release-rtti	12m 38s
build-linux-unity-and-headers	13m 45s
build-macos	21m 24s
build-macos-cmake (true)	1h 9m 35s
build-macos-java	25m 38s
build-macos-cmake (false)	1h 1m 1s
build-macos-java-static	27m 24s
build-windows-vs2019	52m 47s
build-linux-arm	13m 53s
build-linux-java-pmd	11m 55s
build-macos-java-static-universal	36m 52s
	12h 29m 48s

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